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<?php $query = [ 'set1' => ['col1' => 'val1', 'col2'=> 'val2'], 'set2' => ['col1' => 'val3', 'col2'=> 'val4']]; var_dump($query['set1'] === $query['set2']);
based on shB82
Output for 5.6.30, hhvm-3.18.5 - 3.22.0, 7.0.30 - 7.2.6
bool(false)